EP3094018A1 - Procédé et dispositif de régulation de lumière pour réduire un scintillement inter-trame - Google Patents

Procédé et dispositif de régulation de lumière pour réduire un scintillement inter-trame Download PDF

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Publication number
EP3094018A1
EP3094018A1 EP14878314.5A EP14878314A EP3094018A1 EP 3094018 A1 EP3094018 A1 EP 3094018A1 EP 14878314 A EP14878314 A EP 14878314A EP 3094018 A1 EP3094018 A1 EP 3094018A1
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EP
European Patent Office
Prior art keywords
frame
avg
data
dimming
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14878314.5A
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German (de)
English (en)
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EP3094018B1 (fr
EP3094018A4 (fr
Inventor
Ning LV
Zhou ZHI
Zhong Yu
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ZTE Corp
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ZTE Corp
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Publication of EP3094018A4 publication Critical patent/EP3094018A4/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/002—Specific input/output arrangements not covered by G06F3/01 - G06F3/16
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/1141—One-way transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/54—Intensity modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection

Definitions

  • the present disclosure relates to a Visible Light Communication (VLC) technology, and in particular to a light dimming method and device for alleviating inter-frame flicker.
  • VLC Visible Light Communication
  • a VLC technology refers to a technology for short-distance light wireless communication with an optical medium which is visible for human eyes and has a wavelength ranged from 400nm to 700nm.
  • the VLC technology has the advantages of being resistance to electromagnetic interference, having no interference related to a Radio Frequency (RF) system, and being capable of adopting an unlicensed spectrum.
  • RF Radio Frequency
  • the first is to realize a data transmission function; and the second is to avoid the problem of inter-frame flicker during transmission of a data frame.
  • the problem of inter-frame flicker is caused by a difference between average luminance of a light source during data sending and average luminance in an illumination state (that is, a sender is in a receiving state or an idle illumination state).
  • a sender in an idle/receiving state adopts an idle pattern, namely independently sending a frame used for regulating luminance of a light source.
  • Such a method has a requirement on accurate calculation for making a duty cycle of the frame used for regulating the luminance of the light source the same as a duty cycle of a line coding scheme adopted by a physical layer. Therefore, average luminance values of the frame used for regulating the luminance of the light source and a data frame are equal.
  • the embodiments of the present disclosure provide a light dimming method and device for alleviating inter-frame flicker, so as to extend a luminance range of a compensatory frame used for dimming.
  • an embodiment of the present disclosure discloses a light dimming method for alleviating inter-frame flicker, which may include that:
  • the step that whether inter-frame flicker is generated when the sender sends the data or not is judged according to the ratio of Avg data to Avg light may include that:
  • the step that the sender inserts the dimming frame in the idle pattern may include that:
  • the step that the average luminance value Avg data when the sender sends the physical frame is calculated may include that:
  • Another embodiment of the present disclosure further discloses a light dimming device for alleviating inter-frame flicker, which may include:
  • the processing component may be configured to judge whether the following formula is true or not according to Avg data and Avg light : Avg data ⁇ Avg light Avg light ⁇ K , where K is a constant; and when the formula is not true, determine that the inter-frame flicker is generated when the sender sends the data.
  • the processing component may be configured to calculate, according to the following formula, a duty cycle range of a dimming frame to be inserted: 1 ⁇ K ⁇ A ⁇ ⁇ ⁇ K + 1 ⁇ A , where A represents a duty cycle of a line coding method adopted for a physical layer, and K is a constant; and the processing component may be configured to extract dimming information consistent with the duty cycle range from the storage component, generate the dimming frame and insert and send the dimming frame in the idle pattern of the sender.
  • the processing component may be configured to calculate the duty cycle of the line coding method adopted for the physical layer to obtain Avg data .
  • the device may be arranged in the sender of a VLC system, or may be arranged outside the sender of the VLC system.
  • a value of a duty cycle of the physical frame sent to regulate the luminance of the light source in the idle pattern of the sender is within a certain range, and is not required to be accurately equal to the duty cycle of the line coding method adopted for the physical layer.
  • the embodiment of the present disclosure provides a method for alleviating inter-frame flicker based on a light source luminance change rule that human eyes can perceive, that is, a value of a duty cycle of a physical frame sent to regulate luminance of a light source in an idle pattern of a sender is within a certain range, and is not required to be accurately equal to a duty cycle of a line coding method adopted for a physical layer.
  • Avg data when calculating the average luminance value Avg data when the sender sends the physical frame, Avg data may be obtained by calculating a duty cycle of a line coding method adopted for a physical layer.
  • the ratio of Avg data to Avg light may be calculated according to the following formula: Avg data ⁇ Avg light Avg light ⁇ K
  • the formula is obtained according to the Weber-Fechner theorem, and it defines a luminance change that human eyes can feel.
  • Parameter K in the formula is obtained by experiments.
  • the sender sends the dimming frame used for alleviating flicker in the idle pattern.
  • the idle pattern refers to that the sender is in a receiving state or an idle illumination state.
  • average luminance calculation of the inserted dimming frame in the idle pattern is determined by duty cycle calculation of the dimming frame, and a duty cycle ⁇ of the dimming frame is calculated as follows: A ⁇ ⁇ A ⁇ K .
  • parameter A represents the duty cycle of a line coding method adopted for the physical layer
  • parameter K is a constant, and may be obtained by experiments.
  • the value of the duty cycle calculated by the formula is within a certain range. That is, average luminance of the dimming frame is within a certain range. A dimming frame with any average luminance value in the range does not cause any luminance change that human eyes can perceive when achieving the purpose of dimming.
  • Step 100 average luminance Avg data when a sender sends physical frames is calculated.
  • the average luminance may be determined by a duty cycle of line coding adopted when the sender sends the physical frame.
  • a coding duty cycle of a Manchester code is 50%.
  • a Manchester code is adopted for line coding of a physical layer, if luminance of bits "0" is 0 and luminance of bits "1" is 100%, for "0" and "1" sequences (i.e. physical frames) with any length, average luminance of the physical frames is 50%.
  • the sender is in an illumination state, the average luminance is 100%.
  • Step 101 whether inter-frame flicker currently occurs or not is judged according to a ratio of the average luminance Avg data when the sender sends the physical frame to average luminance Avg light in the illumination state, Step 102 is executed if YES, otherwise the sender is kept in the illumination state 103.
  • the formula is obtained according to the Weber-Fechner theorem, and it defines a luminance change that human eyes can feel.
  • Parameter K in the formula is obtained by experiments.
  • inter-frame flicker that human eyes can perceive does not occur when the sender is alternately in a data sending process and the illumination state, that is, inter-frame flicker does not exist, and at this moment, no dimming frame is required to be inserted.
  • Step 102 is required to be executed for dimming frame insertion operation.
  • Step 102 the sender sends a dimming frame used for alleviating inter-frame flicker in an idle pattern (i.e. a receiving state or the illumination state).
  • a duty cycle of the dimming frame used for alleviating inter-frame flicker may be calculated according to the following formula 2: A ⁇ ⁇ A ⁇ K
  • parameter A represents the duty cycle of a line coding method adopted for the physical layer
  • parameter ⁇ is the duty cycle of the dimming frame
  • parameter K is a constant, and is obtained by experiments.
  • a value range of the duty cycle ⁇ of the dimming frame may further be deduced from Formula 2, as shown in Formula 3: 1 ⁇ K ⁇ A ⁇ ⁇ ⁇ K + 1 ⁇ A
  • the diagram of the dimming frame calculated by Formula 3 is shown in Fig. 2 .
  • the dimming frame sent in the idle pattern is only configured to support visibility of the sender, so that processes of line coding, channel coding, modulation and the like may not be required to be executed on the dimming frame sent by the sender, and "0" and "1 "-bit sequences of which duty cycles are consistent with Formula 2 may be directly sent to achieve the purpose of alleviating flicker.
  • the embodiment provides a light dimming device for alleviating inter-frame flicker, which at least includes the following parts:
  • the processing component is configured to judge whether the following formula is true or not according to Avg data and Avg light : Avg data ⁇ Avg light Avg light ⁇ K , where K is a constant; and when the formula is not true, the processing component may determine that the inter-frame flicker is generated when the sender sends the data.
  • the step that the processing component extracts corresponding dimming information from the storage component to generate the dimming frame is implemented as follows:
  • the processing component may obtain Avg data by calculating the duty cycle of the line coding method adopted for the physical layer.
  • the device may be arranged in the sender of a VLC system, or may also be independently arranged.
  • the dimming device at least includes a processing component, a storage component and a light-driven transmission component, wherein:
  • the dimming information in the dimming frame is sequences composed of "0" and "1", read from the storage component, with different lengths.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP14878314.5A 2014-01-07 2014-06-30 Procédé et dispositif de régulation de lumière pour réduire un scintillement inter-trame Active EP3094018B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201410005913.2A CN104767566B (zh) 2014-01-07 2014-01-07 一种缓解帧间闪烁的调光方法和装置
PCT/CN2014/081268 WO2015103855A1 (fr) 2014-01-07 2014-06-30 Procédé et dispositif de régulation de lumière pour réduire un scintillement inter-trame

Publications (3)

Publication Number Publication Date
EP3094018A1 true EP3094018A1 (fr) 2016-11-16
EP3094018A4 EP3094018A4 (fr) 2016-11-16
EP3094018B1 EP3094018B1 (fr) 2019-10-16

Family

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EP14878314.5A Active EP3094018B1 (fr) 2014-01-07 2014-06-30 Procédé et dispositif de régulation de lumière pour réduire un scintillement inter-trame

Country Status (5)

Country Link
US (1) US9887776B2 (fr)
EP (1) EP3094018B1 (fr)
JP (1) JP6397034B2 (fr)
CN (1) CN104767566B (fr)
WO (1) WO2015103855A1 (fr)

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* Cited by examiner, † Cited by third party
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CN106102207B (zh) * 2016-06-01 2017-09-01 南京邮电大学 一种室内白光led的调光方法
WO2020248179A1 (fr) * 2019-06-13 2020-12-17 大连理工大学 Procédé de détermination de caractéristiques de rotation de sources de lumière en fonction d'un calcul de somme pendant un positionnement de lumière intérieure visible

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Also Published As

Publication number Publication date
US9887776B2 (en) 2018-02-06
JP6397034B2 (ja) 2018-09-26
CN104767566A (zh) 2015-07-08
US20160329963A1 (en) 2016-11-10
EP3094018B1 (fr) 2019-10-16
CN104767566B (zh) 2018-11-30
EP3094018A4 (fr) 2016-11-16
JP2017510125A (ja) 2017-04-06
WO2015103855A1 (fr) 2015-07-16

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